As far as I am aware, you can technically bounce between CPs at WDW and DLR without any limit to the amount of CPs you do, even if they are consecutive. As long as you are in school, you can apply. I worked with a girl who used this method three times in a row. The company allows you to do this because you lose your pay rate as you move from each location due to the difference in minimum wage laws, job locations, etc. And as each program ends, you are, on paper, leaving the company (even if your departure and arrival date from each place may be less than a week apart from each other.)
You will, however, lose your scheduling seniority. While I do not know how scheduling works in WDW, when I left the CP and became a CR (part time) at DLR, I lost ALL of my scheduling seniority. In the middle of the summer, I went from 50 hours a week, to 12 hours a week. This depends if you are with a union or not. My hire date and yearpin dates were not affected. I did not have any issues with transferring from the CP to a CR.